Cancellation of Contract

My contract ended on 15/08/2017. I have emailed my Cancellation Form to ********** on the 05/07/2017. No reply that they received it. I resend the application on the 12/07/2017 asking them to confirm if they received the email, still no response. On the 01/08/2017 I have contacted the call center to know how I can get a hold of the cancellations department they only told me there is no direct line and it takes up to 21 - 25 working days to submit the cancellation. On the 14/08/2017 I have contacted the call center again to confirm if my contract is canceled and the sim is on prepaid, but there was nothing on my account that I have asked for a cancellation. I have sent my cancellation form to a Yolandie Kettel at the PE branch and she would have submitted the cancellation. I can call again on the 16/08/2017. Contacted again on the 16th nothing was submitted. I have emailed Yolandie again but no response. I have contacted every day since but still, nothing submitted. I have spoken to Dviyan Primo on 22/08/2017 and send my cancellation Form to her again. If nothing gets done by Friday 25/08/2017 I am going to stop my debit order and refuse to pay anything and demand on credit for my calls to the Call center.